Dataset Information

Symbiosis induces widespread changes in the proteome of the model cnidarian Aiptasia

ABSTRACT: Coral reef ecosystems are metabolically founded on the mutualism between corals and photosynthetic dinoflagellates of the genus Symbiodinium. The glass anemone Aiptasia sp. has become a tractable model for this symbiosis. We utilized label-free liquid chromatography electrospray-ionization tandem mass spectrometry to analyze the effects of symbiosis on the proteomes of symbiotic and aposymbiotic Aiptasia. We quantified more than 3,300 proteins in 1,578 protein clusters, with 81 protein clusters showing significantly different expression. Symbiotic anemones showed higher expression of proteins involved in lipid storage and transport, nitrogen transport and cycling, intracellular trafficking, endocytosis and inorganic carbon transport. These changes reflect shifts in host metabolism and energy reserves due to increased organic and inorganic nutritional exchange with the symbionts. Aposymbiotic anemones exhibited increased expression of multiple systems responsible for mediating reactive oxygen stress, suggesting that the host derives direct or indirect protection from oxidative stress while in symbiosis. Aposymbiotic anemones also increased their expression of an array of proteases and chitinases, indicating a metabolic shift from autotrophy to heterotrophy. These results provide a comprehensive Aiptasia proteome with more direct relative quantification of protein abundance than transcriptomic methods, allowing more powerful studies of coral physiology and ecosystem function.

INSTRUMENT(S): LTQ Orbitrap

ORGANISM(S): Aiptasia Pulchella (tropical Sea Anemone)

TISSUE(S): Whole Body

SUBMITTER: Clinton Oakley

LAB HEAD: Simon Davy

PROVIDER: PXD003202 | Pride | 2017-02-22

REPOSITORIES: Pride

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Symbiosis induces widespread changes in the proteome of the model cnidarian Aiptasia.

Oakley Clinton A CA Ameismeier Michael F MF Peng Lifeng L Weis Virginia M VM Grossman Arthur R AR Davy Simon K SK

Cellular microbiology 20160205 7

Coral reef ecosystems are metabolically founded on the mutualism between corals and photosynthetic dinoflagellates of the genus Symbiodinium. The glass anemone Aiptasia sp. has become a tractable model for this symbiosis, and recent advances in genetic information have enabled the use of mass spectrometry-based proteomics in this model. We utilized label-free liquid chromatography electrospray-ionization tandem mass spectrometry to analyze the effects of symbiosis on the proteomes of symbiotic a ...[more]

PMID: 26716757

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Project description:Coral bleaching has devastating effects on coral survival and reef ecosystem function, but many of the fundamental cellular effects of thermal stress on cnidarian physiology are unclear. We used label-free liquid chromatography-tandem mass spectrometry to assess the effects of high temperatures on the proteome of the model symbiotic anemone Aiptasia sp. Anemones were acclimated to elevated temperatures (30 °C and 33.5 °C) for two weeks or exposed to short-term thermal shock (33.5 °C, 24 hours) without acclimation. We identified 2,137 protein clusters in Aiptasia, 136 of which were differentially abundant between treatments. There were minimal differences (nine proteins) in protein abundances between the control (25 °C) and acclimated high-temperature (30 °C and 33.5 °C) treatments, indicating that thermal acclimation in symbiotic cnidarians is not primarily regulated at the level of protein expression. Heat shock resulted in significant changes in the abundance of 104 proteins, including those involved in protein folding and synthesis, redox homeostasis, and central metabolism. Nineteen highly abundant cytoskeletal and structural proteins showed particularly reduced abundance (approximately 50%), demonstrating proteostasis disruption and inhibition of protein synthesis. Heat shock induced proteins involved in multiple mechanisms for stabilizing nascent proteins, preventing protein aggregation and degrading damaged proteins, indicative of endoplasmic reticulum stress. Antioxidant mechanisms and metabolic enzymes necessary for redox homeostasis were also upregulated. Disruption of host proteostasis occurred before either bleaching or symbiont photoinhibition was detected, strongly suggesting endogenous reactive oxygen species production as the proximate cause of thermal damage. The effects of thermal shock were most pronounced at the endoplasmic reticulum, and proteostasis maintenance and protein turnover mechanisms may be essential in the response to severe thermal stress in symbiotic cnidarians.

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	AvS_A1.mzid	Mzid
	AvS_A1.mzid_AvS_A1.MGF	Mzid
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	AvS_A1_150304041916.msf	Msf